| Plumbtech Services Limited | Construction | 2002 |
| Pluranet Limited | Information & communication | 1998 |
| PLUS4GROUP Limited | Information & communication | 2004 |
| PM Properties (Surrey) Ltd | Real estate | 2025 |
| PM Services (London) Limited | Real estate | 2002 |
| PMO Global Solutions Ltd | Information & communication | 2019 |
| PNA Fuel Ltd | Wholesale & retail | 2024 |
| Pocket Full of Green Limited | Administrative & support | 2005 |
| Polar Adventures (2010) Ltd. | Arts & recreation | 2006 |
| Polar Adventures Ltd | Arts & recreation | 1996 |
| Polarcold Limited | | 1947 |
| Polefern Limited | Households | 1996 |
| Polewood Properties Limited | Construction | 2009 |
| Pomax Limited | Professional & scientific | 2011 |
| Pomery Natural Stone Limited | Wholesale & retail | 1996 |
| Pond Ventures II Associates L.P. | | 2000 |
| Pooks Hill Management Company Limited | Households | 1996 |
| Porta Romana Limited | Professional & scientific | 2000 |
| Portcorde Limited | | 1982 |
| Portia (UK) Limited | Wholesale & retail | 2004 |
| Portleigh Limited | Households | 1982 |
| Portmore Quays Residents Limited | Real estate | 1993 |
| Portsmouth Yacht Charter Ltd | Transport & logistics | 2022 |
| Post Linear Creations Limited | Extraterritorial | 2004 |
| Pottershand Limited | Professional & scientific | 2003 |
| Power Pages Limited | Other services | 2006 |
| Powerail Builders Limited | Construction | 1997 |
| Powercrest Consulting Limited | Information & communication | 1999 |
| Powerpoint-Plus Limited | Information & communication | 2006 |
| PR Contractors Limited | Wholesale & retail | 1998 |
| Practique Solutions Limited | Construction | 2007 |
| Praha Consultancy Services Limited | Information & communication | 2018 |
| Prax Air Limited | Financial services | 2021 |
| Prax Capital Limited | Financial services | 2021 |
| Prax Energy Limited | Financial services | 2021 |
| Prax GAS and Power Limited | Financial services | 2021 |
| Prax Midstream UK Limited | Financial services | 2023 |
| Precision Iasis Estates Ltd | Real estate | 2023 |
| Precision Iasis Limited | Health & social care | 2021 |
| Precision Services UK Limited | Professional & scientific | 2008 |
| Preferred Broadband Limited | Wholesale & retail | 2003 |
| Preferred Cruise Limited | Wholesale & retail | 2003 |
| Preferred Games Limited | Information & communication | 2003 |
| Preferred Journals Limited | Wholesale & retail | 2003 |
| Preferred Limited | Wholesale & retail | 2003 |
| Preferred Mobiles Limited | Wholesale & retail | 2003 |
| Preferred Movies Limited | Information & communication | 2003 |
| Preferred Music Limited | Information & communication | 2003 |
| Preferred Names Limited | Information & communication | 2003 |
| Preferred Ring Tones Limited | Information & communication | 2003 |
| Preferred Toys Limited | Wholesale & retail | 2003 |
| Prem Investments Limited | Professional & scientific | 2004 |
| Premier Cash Registers Limited | Manufacturing | 1990 |
| Premier Heating Supplies | | 1993 |
| Premier Pool Services Ltd | Other services | 2007 |
| Premier Retail Systems Rental Limited | Administrative & support | 1986 |
| Premier Service Station Ltd. | Wholesale & retail | 2003 |
| Preptech UK Ltd | Wholesale & retail | 2006 |
| Presbyterian Church of Ghana, Calvary Congregation,London | Other services | 2005 |
| Prestige Wedding Fairs Limited | Administrative & support | 2003 |
| Presto Consultancy Limited | Professional & scientific | 1998 |
| Preston ST Mary Residents Association Limited | Real estate | 1982 |
| Preuveneers LLP | | 2004 |
| Price Ferguson Limited | Financial services | 1999 |
| Pricetally Ltd | Professional & scientific | 2003 |
| Pride Electrics Limited | | 1979 |
| Prident Dental Laboratory Limited | Health & social care | 2016 |
| Prime Electronics Limited | | 1985 |
| Prime FSM Ltd | Manufacturing | 2024 |
| Prime Sites (Holdings) Limited | Construction | 1955 |
| Prime Wealth Management Ltd | Financial services | 2017 |
| Primebond Limited | Wholesale & retail | 1981 |
| Primecourt Limited | Real estate | 2015 |
| Primetime Training Enterprises Limited | Administrative & support | 2006 |
| Princes Court (Tadworth Park) Limited | Households | 1987 |
| Princess Alice Hospice | Education | 1981 |
| Principal London Property Co. Limited | Real estate | 1947 |
| Principle Developments Ltd | Professional & scientific | 1999 |
| Principle Fork Lifts Limited | Manufacturing | 1990 |
| Prior's Field School Trust Limited(The) | Education | 1960 |
| Priors Croft (Old Woking) Management Company Limited | Households | 1979 |
| Priory Bridge (Development) Limited | Real estate | 2006 |
| Priory Management (Richmond) Limited | Real estate | 1998 |
| Priory Veterinary Surgeons Limited | Professional & scientific | 2003 |
| Prishtina Holdings 2 Ltd | Financial services | 2024 |
| Prishtina Holdings Ltd | Financial services | 2016 |
| Prism Event Management Limited | Administrative & support | 1999 |
| Pristine Accessories Limited | Wholesale & retail | 2024 |
| Pristine Data Limited | Information & communication | 1999 |
| Pristira Ltd | Real estate | 2024 |
| Privacy Solutions Ltd | Professional & scientific | 2002 |
| Privett Installations Ltd | Construction | 2015 |
| Pro Care (G.B.) Limited | Construction | 2004 |
| Pro Serve Electrical Ltd | Other services | 2016 |
| Process Driven Limited | Professional & scientific | 2005 |
| Prodoc Training Limited | Information & communication | 2002 |
| Professional Data Systems Ltd. | Professional & scientific | 1998 |
| Proficient Environmental Services Ltd | Administrative & support | 2011 |
| Profile Properties Limited | Real estate | 1982 |
| Progas Boilers Limited | Extraterritorial | 1992 |